China Shipping Century is a shipping company, not a school. If you sign a contract from their company, it can only be regarded as a commission. Boarding internships must be charged, and employment is not guaranteed. Now the market is saturated with crew, and many crew members can't find a boat.
As for payment, it depends on what is written in the contract you signed.
I usually practice at sea for one year. During this year, you may board many ships and pay many fees.